Davit



S. E. AARON.

I DAVIT.

APPLICATION FILED MAR, 22,1919.

glswrninr Patented July 6, 1920.

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glihanwuz" S. E. AARON.

DAVIT.

APPLICATION FILED MAR. 22. 1919. 1,345,821.

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Patented July 6, 1920.

UNITED STATES SOLOMON E. AARON, F BOSTON, MASSACHUSETTS.

DAVIT.

Application filed March 22,

' citizen of the United States, residin at Boston, in the county of Suffolk and btate of Massachusetts, have invented certain new and useful Improvements in Davits; and I do hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the art to which it appertains to make and use the same.

This invention relates to ship handling apparatus and particularly to improvements in tin-hing mechanism for davits.

One of the present methods of handling ships lifeboats or the like consists in suspending them when being handled from a pair of davits, these commonly being in the form of bowed, tapered stanchions of considerable weight and of massive construction, which together with the weight of a loaded or unloaded lifeboat require considerable force in the operation of swinging the lifeboat from an inboard to an outboard or from anoutboard to an inboard position. I-Ieretofore a common method of securing this swinging movement has been entirely through manual labor, by pressure against one or the other or both ends of the lifeboat as soon as it is lifted from its chocks, and this is not only an extremely laborious but as well. also a dangerous task, especially when seas are heavy. Also a system of swinging the boats in or out comprises power mechanism attached to the davits, and these are operated manually or otherwise to swing the davits, and it is an especial object of the present invention to improve the power or davit turning mechanism now generally used and well known, first, so as to enable the attachment of a turning mechanism to a davit either before it is installed orafter it is installed, and obviously in the latter case it is desirable and it is an object of the present invention to mount an element of the turning mechanism on the davit body in a manner to entirely eliminate the requirement of any machining or alteration of'the body or construction of the body; and, furthermore, an important object of the invention is to provide an element of a turning mechanism, preferably in the form of a gear, which may be readily and accurately and re:

Specification of Letters Patent.

Patented July 6, 1920. 1919. serial No. 284,474.

liably connected to the body of the davit, although the latter may be of the curved or bowed type.

Again, while mechanisms have been utilized to secure mechanical power turning of davits, there are certain disadvantages in these mechanisms for the reason that the associated gear mechanisms, one of which is attached to the davit and the other to another support, tend to become dissociated or unmeshed because of the fiexure or swaying of the davit, with the result that the gear thereon is carried away from its driver. Again, it is not desirable to provide split gears on the davits, because this not only weakens the structure of the gear but also interrupts the regularity of the tooth body, with the result that because of variation of pitch of certain of the teeth these will become jammed and possibly mutilated when moving into registration or mesh with cooperative teeth on the driver. A further disadvantage of using a split gear on the davit is that the pressures and stresses developed are transmitted at one time or another to the fastening means between the sections of the davit gear, and this fastening means forming the weak element in the gear may be readily disrupted, with the result that the davit is rendered uncontrollable by the mechanism. I

Therefore, with the above and other 0 jects in view as will be readily manifest to those versed in the art, the invention consists in the construction, the combination, and in details and arrangements of the parts as more particularly set forth in the following specification relative to the embodiment of the invention illustrated in the accompanying drawings, in which:

Figure 1 is a view showing in section a fragment of a boat deck, and showing in elevation a pair of davits of standard type on which may be mounted and swung a lifeboat or other boat, indicated in dotted lines, this view being taken from the inboard position;

Fig. 2 is a detail sectional view along the axis of a davit, showing the improved turning mechanism and davit gear;

Fig. 3 is an elevation from the inboard side of one of the davit turning mechanisms, and showing a portion of the davit; and

Fig. 4 isan elevational view from the outboard side of the davit and mechanism. The invention is shown as adapted for use in combination with a pair of davits 2, 2, suitably stepped in the deck 3 of a vessel; these davits, as clearly shown indotted lines, Fig. 1, being of the bowed or curvedform very extensively used in this art, and no invention is claimed for the construction of the davit, per se. The fall block, of any usual and appropriate con struction and which is diagrammatically illustrated at 5, 5, Fig. 1, is attached to the head of the davit, and includes the lower block suitably connected to the ends of the lifeboat, indicated by dotted lines at L.

The invention under consideration in the present case especially resides in a gear adapted to be readily mounted upon this type of boat davit 2, and also resides in ,is formed a-spiral' gear 8, over the smaller. and head end of the davit 2, and thence freely downward along its curved body to the substantially straight portion thereof, as shown in Fig' 2, but also enables the utilization of the well known and thoroughly practicaland reliable form of fastening means tosecure the gear annulus inposition. By thus forming the annulus with tapered body 7, the curvature of the'body of the davit is compensated for through the -axis of theannulus, and the gear can be I already in place.

quickly brought into positionwithout neces- .sitating the-unstcpping ofthe davit from its mounting 'on the deck ordeck structure, and furthermore enables the assembling of the parts with equal facilityrwhether the davit has been stepped or, as suggested, is V p 7 A simple, practicable, and easlly adgustable type of means for 'rii'astening the gear in place on the daviti's shown as comprising a plurality of longi- 'tudinally' adjustable wedge gibs 9, 9, fitting respective gibbed ways 10, providedthere for in the surface of the annulus bore 7.,

and having at its upper ends setting-and lock bolts 11', 11,. which serve to. am the 'gibs down firmly into their seats and inwardly upon thesurface of the davit 'so thatj-thje annulusis securely locked without" requiring any machining or other alteration whatsoever'upon thesurfaceor body of j the device. r

' The other important feature of the in 'vention above alluded to resides in the -prodavit 2.

vision of means by which a driver or actuating worm 15, keyed orotherwisc secured on its shaft 16, which may be provided on itsrend with a crank or hand wheel 17, may be constantly held in the proper meshing position with respect to the gear 8 on the davit, thus obviating accidental separation of the meshing gears owing to the swaying or fleXure of the davit body with respect to its stepped bore and also with respect to a suitable, mounting or standard on which the driving gear 15 may be supported. To that end the gear shaft 16 is journaled upon bearings 18,formed upon or attached to a slide 19 dovetailcd'or otherwise slidabl supported on the head of. a mounting or standard 20, provided. with ways complementary to the base slide 19. The slide 19' is designed to shift transversely with respect to its standard'ZO, to follow move ment of the davit 2 fromany cause, and the outer end of the slide 18 is provided with a bearing, collar, or portion 21, em bracing the adjacent portion of the davit 2, and as here shown is arranged just below the bottom of the annulus? From this it will be seen that irrespective of any swaying or flexing movement of the davit 2, the

gear thereon willbe constantly held in mesh with the worm 15 which is secured on the shaft .16, because of the fact that a driver ismou'nted in a sliding bearing on theshde 19, which while guided on the standard 20 permits the. whole turning mechanism to shift freely with bodily oscillations of the What I claim is:

1. The combination with of astandard arranged beside the davit and wholly independent thereof, a slide mounted on the standard and connected to the davit to float therewith in oscillations of the davit bodily with. respect to the standard, a gear mounted on the davit, and drivingmechavnism mounted on said'slide andengaging said gear.

2. The combination with a davit and a support; of a turning-mechanism slidably ,mountcd on the support and connected to the davit soas to float therewith bodily.

3. The combination with-a davit and a a stepped davit,

support; of a turning mechanism slidablymounted on the support and connected to the davlt so as to float'therewith bodily, the said mechanism including a gear and its bearing slidably guided inits mounting on the support, the davit having a gear engaging thesliding gear.

4. .The combination with a davit, of an integral annulus gear formed with a hub,

'saidhub having its central opening of'sufficientsize for placing it onthe davit by.

sliding it over the upper end thereof, and means for fastening the gear in place.

5. The combinationjwith a davit, of an integral annulus with exterior teeth and having a tapered bore to facilitate placing the gear on the davit without necessitating unstepping of the davit, and means for fastening the gear in place.

6. The combination with a davit, of an integral annulus with exterior teeth and having a tapered bore to facilitate placing the gear on the davit without necessitating un-stepping of the davit, and means for fastening the gear in place.

7. The combination with a davit, of an integral annulus with exterior teeth and having a tapered bore to facilitate placing the gear on the davit without necessitating Lin-stepping of the davit, and means for fastening the gear inplace, said means comprising tapered gibs attached to the annulus and adjustable to set the gear.

8. The combination'with a davit, of an integral annulus with exterior teeth and having a tapered. bore to facilitate placing the gear on the davit without necessitating un-stepping of the davit, and means for fastening" the gear in place, without requiring machining of the body of the davit.

9. A turning mechanism for upright davits, comprising a standard to be arranged adjacent to the davit but independent thereof, a gear adapted to be secured on the davit and a driving gear therefor, and means slidably mounted on the standard for carrying the driving gear and keeping it in mesh with the gear on the davit irrespective of swaying movement of the latter with respect to the standard.

10. An integral annular gear having a tapered central opening and gib ways, wedge-gibs adapted to fit the gib Ways, and means comprising bolts for locking the wedge gibs in place and fastening the gear to a shaft.

11. In combination, a davit, transmission means for rotating said davit, a standard for carrying said transmission, said trans- HliSSlOl'l having a free radial movement relative to said standard.

12. In combination, a davit, a Worm gear mounted thereon, a worm co-meshing with said gear,.a carriage holding said worm and gear in co-meshing relation, said carriage mounted to slide on its support with the swaying of the davit.

13. In combination, a davit a gear mounted thereon, a power transmission member in co-meshing relation with said gear, a bearing for holding the two said co-meshing members, in suitable co-meshing relation and means for mounting said bearing for movement'in relation to the mounting of the davit so as to slide as the davit swings.

In testimony whereof I aflix my signature.

SOLOMON E. AARON. 

